Process of dyeing leather



w Patented Jul 16" .v

" UN EDZF TAT rnocsss fl No jDrawing. 'Application April Q0, 1934,- Serial i No. 721,s4o.- In Switzerland April 22,193 v p invention relates to a process of dyeing I leather fast shades by means of. complex metallic compounds 01' mono-azo-dyestufls which have the general formula: v I

of the 'ni'ckeliferous' dyestuli' stuff or the .formula I (o1. 8-5 a a l. there is rim in; through the hollowaxle, a

tion (1 part of dyestufl'in 50 parts of boiled water) from the azo-dye- 0H on R1'N=N'-R: r

V on- .110.

wherein R and R2 represent aryl residues anda: a lake-forming group in ortho-position to the I azo-group. ,u p I I I I v complex metallic compounds of mono-azow dyestuffs 01. this general formula are, for example, obtainable couplingdlazoflzed 7 aluminium-, titanium-, vanadium-, chromium-, acid with copper-, manganese; iron-, cobalt-(nickel and dihydroxybenzene "After about 40 minute! the uranium-compounds of azo-dyestufis which are fiyestufi has been adsorbed by the leather which obtainable by coupling the diaz'otiz ed ortho hye h ffltliquored as usual: droxyor orthoealkoxyor-ortho carboxy-amino- The leatherithus dyed has brqwn shade which benzenes-or ort'ho-hydroxy or ortho-alkoxyo'r' y y fast' ortho-carboxyamincnaphthalenes or a 'deriva-- mm is'rdyed throughg 9 i g h ifig for exgmpl, a 1l111OIine-.,, I Example 1 J romine--,' ro-,v s o-, car oxy-,-me oxyor -h ethoxy-substitution- Product with a dihydr'oxy-M e i m e 3 sheep goat benzene or a dihydroxynaphthalenei'or example n d as described m Example with 1:3-dihydroxybenzen e, 1:3-.-dihydroxybenzene-4- Q mdy9 ih fi' e 5 carboxylic acid, 1:3-diliyclroxybenzene-5-carfqrmula I v i boxylic acid, 1:2:3-trihydroxybenzene-5s-carboxylic acid, "1:5-dihydroxynaphthalene, 2 6-dihydroxynaphthalene or 2:"l-dih'ydroxymatphtha-v lene as well as the sulfonic acids vand -nitro-, alkylorhalogen-substitution products'of any.

of these. These complex metallic compounds may contain one or more metals; f .e Y The complex metallic compounds to be used obtainable 1 1 8 di zotized 4-chloro-2-am- 'dye leather, tanned in any mannenior example; b i h ll3-dlhmoxybenzenevegetable-tanned leather or'chrome-leathen'very w ed e s is mp d i 1 d ed various tints which are very level and excellently formic acid amounting 1 W h 01 e fa t v p s p -dyesti1eilf utsfid lancghdyeilsnizmis cloirliltginied for 10-15 11 -minu' s; e ea er en e fig ff examples strate 1 The leather thus dyed base level. 1'ull brown- 40 Example 1 v olive shade which is very fast to light.

' g The dyeing can also be conducted by the 100 parts of neutralized chrome-leather (box brushing process with aneutral, cold liquor. calf, chrome sides, goat, kid and sheep) are The following table gives a-series or the dyev, tumbled in a drum in a bath of 3-400 partsof stuffs serving for the present process and the water at 60 C. During the rotation 01' the drum, colours obtained therewith Diemcomponent Coupling-component Metal 7 7 Colours obtained v 1 4-nitro-2-amino-l-hydroxybenzened 1:3-dihydroxybenun U .Yellowish brown..-

sulfonic acid. d 4 M I Brown i-nitggfz-amino-l-hydroxybenzen d" mzaneae g i wn 4 fln (in Ir Yellow-brown.

5 (in dn Cnh Brown-red. E6; Nicl r i ll 'Oraiziogg. I 2 3%??? g: go giii'dlgzililxamwn 5-nigg-2-amino-l-hydroxybenzene 02: B0210:- u a do NickeL. Pink. 12 rln n Mangan Brown-orange. 132 U-nitro-Z-umino-l-hydroxybenzenH- fin Cobalt Brown-violet.

, sulfonic acid.

. on l I o Gt! V v OH on I N0 N I no on 01-05 I Q on COOH OH OCQHI What we claim is: 1. Process of dyeing leather, consisting in using the complex metal compounds of such monoing in ortho-position to the azo-bridge, R1 is a phenylradical free from a. carboxylic acid group in ortho-position'to the lake-forming group and R: is a phenyl or naphthyl radical.

2. Process of dyeing leather, consisting, in us-' ing the complex metal compounds of such monoazo-dyestufls which correspond to I the general formula I v a wherein :2: represents a lake-forming group standing in ortho-position to the azo-bridge, R1 is a phenyl radical free from a carboxylic acid group in ortho-position to the lake-forming group, and R2 is a phenyl radical.

3. Process of dyeing leather, consisting in using the complex metal compounds of such monoazo-dyestufls which correspond to the general formula B:N=NR:

on on wherein R1 is a phenyl radical free from a carboxylic acid group in ortho-position to the hydroxyl group, R: is a phenyl radical, and the hydroxyl group 01 the phenyl radical R1 stands in ortho-position to the azo-bridge.

4, Process of dyeing leather, consisting in using 'phenyl radical B1 stands in azo-bridge. J 8. Process of dyeing leather, consisting in using. the complex iron compound of the monoazo-dye the complex metal compounds of such monoazodyestuffs which correspond to-the general formula wherein R1 a phenyl radical free from'a carboxylic acid group in ortho-position to the hydroxyl group, and the hydroxyl group of the azo-bridge. i

5. Process of dyeing leather, consisting in using the complex iron compounds of such monoazodyestufls which correspond tothe general for 1 wherein R1 is a phenyl radical free from a carboxylic acid group in ortho-position to. the hydroxyl group, and the hydroxyl group 01 the phenyl radical R1 stands in ortho-position to the stu'if ofthe formula 7. As-new compositions of matter of yellow, brown, red, violet and green tint, the coloured leather dyed fast with the complex metal compounds of such monoazo-dyestuils which correspond to the general formula v wherein 1: represents a lake-forming group stands ing in ortho-position to the azo-bridge, R1 is a phenyl radical from a carboxylic acid group in ortho-positiorr. to the lake-forming group and R: is a phenyl or naphthyl radical.

8. As new compositions of matter of yellowbrown, brown, red and violet tint, the coloured leather dyed fast with the complex metal compounds of such monoazo-dyestufls which corre spond to the general formula I wherein :2: represents a lake-forming group stand- R: is aphen yl radical.

, 9. As-new compositions of matter of yellowortho-position to the ing in ortho-position to the azo-bridge, R1 is a phenyl radical free from a carbon'lic-acid group inortho-position to the lake-forming group, and

brown, brown, red and violet tint, the coloured [leather dyed fast with the complex metal compounds of such monoazo-dvestuifs which corre-- spond'to the general formula Ri-"N=N'Bi on OH wherein R1 is a phenyl radical free from a carboxylic acid group in ortho-position to the hydroxyl group, R2 is a phenyl radical, and the hydroxyl group of the phenyl radical R1 stands in ortho-position to the azo-bridge.

'10. As new compositions of matter of yellow-- brown, brown, 'red and violet tint, the coloured leather dyed fast with the complex metal compounds of such monoazo-dy'estufls' which correspond to the general formula 7 wherein R1 is a phenyl radical free from a carboxy1ic acid group in ortho-position to the hydroxyl group, and the ltydroxyl group of the phenyl radical R1 stands in ortho-position to the aim-bridge.

11. As new compositions of matter of brown tint, the coloured leather dyed fast with the complex iron compound of such monoazo-dyestufis which correspond to the general formula wherein R1 is a phenyl radical free from a carboxylic acid group in ortho-position to the hydroxyl group, and the hydroxyl group of the phenyl radical R1 stands in ortho-position to the azo-bridge.

I 12. .As new composition ofmatter of brown tint, the coloured leather dyed fast with thecomplex iron compound of the monoazo-dvestuii of 

